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參數(shù)資料
| 型號： | MAX306 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Precision.16-Channel/Dual 8-Channel.High-Performance.CMOS Analog Multiplexers |
| 中文描述： | 高精度、16通道/雙8通道、高性能、CMOS模擬多路復(fù)用器 |
| 文件頁數(shù)： | 11/18頁 |
| 文件大?。?/td> | 503K |
| 代理商： | MAX306 |
Detailed Description
The MAX3054/MAX3055/MAX3056 interface between
the protocol controller and the physical wires of the bus
lines in a CAN. The devices provide differential transmit
capability and switch to single-wire mode if certain fault
conditions occur (see the
Failure Management
section).
The MAX3054/MAX3055/MAX3056 guarantee full wake-
up capability during failure modes.
The extended fault-protection range of CANH and
CANL bus lines (±80V) allows for use in 42V automotive
applications. A current-limiting circuit protects the
transmitter output stage against overcurrent faults. This
feature prevents destruction of the transmitter output
stage. If the junction temperature exceeds a value of
approximately +165
°
C, the transmitter output stages
are disabled. The CANH and CANL lines are also pro-
tected against electrical transients, which can occur in
an automotive environment.
The transceiver provides three low-power modes that
can be entered and exited through pins
STB
and EN.
An output INH pin can be used for deactivation of an
external voltage regulator.
The MAX3054/MAX3055/MAX3056 are designed to
provide optimal operation for a specified data rate. The
MAX3054 is ideal for high data rates of 250kbps. The
MAX3055 is used for data rates of 125kbps, and the
MAX3056 is designed for 40kbps applications. For the
40kbps and 125kbps versions, the built-in slope-control
feature allows the use of unshielded cables and receiver
input filters guarantee high noise immunity.
Normal Operation Mode
Transmitter
The transmitter converts a single-ended input (TXD)
from the CAN controller to differential outputs for the
bus lines (CANH, CANL).
Receiver
The receiver takes differential input from the bus lines
(CANH, CANL) and converts this data as a single-
ended output (RXD) to the CAN controller. It consists of
a comparator that senses the difference
V = (CANH -
CANL) with respect to an internal threshold.
BATT
The main function of BATT is to supply power to the
device when vehicle battery voltage is supplied.
BATT can handle up to +80V making it ideal for 42V
automotive systems allowing power-up of the device
when the ignition is turned on.
M
±80V Fault-Protected/Tolerant CAN
Transceivers for In-Car Applications
______________________________________________________________________________________
11
Pin Description
PIN
1
2
3
NAME
INH
TXD
RXD
FUNCTION
Inhibit Output. Inhibit output is for switching an external voltage regulator if a wake-up signal occurs.
Transmit Data Input
Receive Data Output
4
ERR
Error. Wake-up and power-on indication output; active low in normal operating mode when the bus
has a failure and in low-power modes (wake-up signal or power-on standby).
5
STB
Standby. The digital control signal input (active low) defines, together with input signal on pin EN, the
state of the transceiver (in normal and low-power modes).
6
EN
Enable. The digital control signal input defines, together with input signal on pin
STB
, the state of the
transceiver (in normal and low-power modes).
7
8
9
10
11
12
13
14
WAKE
RTH
RTL
V
CC
CANH
CANL
GND
BATT
Wake-Up. Local wake-up signal input; falling and rising edges are both detected.
Termination Resistor. Termination resistor connection for CANH bus.
Termination Resistor. Termination resistor connection for CANL bus.
Supply Voltage. Bypass to ground with a 0.1μF capacitor.
High-Level Voltage Bus Line
Low-Level Voltage Bus Line
Ground
Battery Supply. Bypass to ground with a 0.1μF capacitor.
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